Make chrome.alarms API accept non-integers and too-short delays.

chrome/browser/extensions/api/alarms/alarm_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__
 #define CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__
 
 #include <string>
 #include <map>
 #include <vector>
@@ skipping 105 matching lines @@
   // Internal helper to add an alarm and start the timer with the given delay.
   void AddAlarmImpl(const std::string& extension_id,
                     const Alarm& alarm);
 
   // Syncs our alarm data for the given extension to/from the state storage.
   void WriteToStorage(const std::string& extension_id);
   void ReadFromStorage(const std::string& extension_id,
                        scoped_ptr<base::Value> value);
 
   // Schedules the next poll of alarms for when the next soonest alarm runs,
-  // but do not more often than min_period.
-  void ScheduleNextPoll(base::TimeDelta min_period);
+  // but not more often than the minimum granularity of all alarms.
+  void ScheduleNextPoll();
 
   // Polls the alarms, running any that have elapsed. After running them and
   // rescheduling repeating alarms, schedule the next poll.
   void PollAlarms();
 
   // NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
@@ skipping 12 matching lines @@
   // The previous and next time that alarms were and will be run.
   base::Time last_poll_time_;
   base::Time next_poll_time_;
 
   DISALLOW_COPY_AND_ASSIGN(AlarmManager);
 };
 
 }  //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__